Hw jv jdbc intro

pom.xml

@@ -14,4 +14,11 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 
+    <dependencies>
+        <dependency>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <version>8.1.0</version>
+        </dependency>
+    </dependencies>
 </project>

src/main/java/mate/academy/Main.java

@@ -1,7 +1,41 @@
 package mate.academy;
 
+import mate.academy.dao.BookDao;
+import mate.academy.lib.Injector;
+import mate.academy.model.Book;
+
+import java.math.BigDecimal;
+
 public class Main {
+    private static final Injector injector = Injector.getInstance("mate.academy");
+    private static final String LINE_SEPARATOR = System.lineSeparator();
+
     public static void main(String[] args) {
+        BookDao bookDao = (BookDao) injector.getInstance(BookDao.class);
+
+        Book EffectiveJava = new Book();
+        Book CleanCode = new Book();
+        EffectiveJava.setTitle("Java: Effective programming 3th ed");
+        EffectiveJava.setPrice(new BigDecimal(15));
+        CleanCode.setTitle("Clean code: A Handbook of Agile Software Craftsmanship");
+        CleanCode.setPrice(new BigDecimal(10));
 
+        Book createdEffectiveJavaBook = bookDao.create(EffectiveJava);
+        Book createdCleanCodeBook = bookDao.create(CleanCode);
+        System.out.println("-----CREATING-----");
+        System.out.println(createdEffectiveJavaBook);
+        System.out.println(createdCleanCodeBook);
+        System.out.println(LINE_SEPARATOR + "-----FIND BY ID-----");
+        System.out.println(bookDao.findById(createdCleanCodeBook.getId()));
+        System.out.println(LINE_SEPARATOR + "-----FIND ALL-----");
+        bookDao.findAll().forEach(System.out::println);
+        System.out.println(LINE_SEPARATOR + "-----UPDATE-----");
+        System.out.println("Before update: " + createdEffectiveJavaBook);
+        createdEffectiveJavaBook.setPrice(new BigDecimal(20));
+        System.out.println("After update: " + bookDao.update(createdEffectiveJavaBook));
+        System.out.println(LINE_SEPARATOR + "-----DELETE-----");
+        System.out.println(bookDao.deleteById(createdEffectiveJavaBook.getId()) ?
+                createdEffectiveJavaBook.getTitle() + " is successfully deleted"
+                : createdEffectiveJavaBook.getTitle() + " is not deleted");
     }
 }

src/main/java/mate/academy/dao/BookDao.java

@@ -0,0 +1,13 @@
+package mate.academy.dao;
+
+import java.util.List;
+import java.util.Optional;
+import mate.academy.model.Book;
+
+public interface BookDao {
+    Book create(Book book);
+    Optional<Book> findById(Long id);
+    List<Book> findAll();
+    Book update(Book book);
+    boolean deleteById(Long id);
+}

src/main/java/mate/academy/dao/BookDaoImpl.java

@@ -0,0 +1,111 @@
+package mate.academy.dao;
+
+import mate.academy.exception.DataProcessingException;
+import mate.academy.lib.Dao;
+import mate.academy.model.Book;
+import mate.academy.services.ConnectionUtil;
+import java.sql.*;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+
+@Dao
+public class BookDaoImpl implements BookDao {
+    @Override
+    public Book create(Book book) {
+        String query = "INSERT INTO books (title, price) VALUES (?, ?)";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(query,
+                     Statement.RETURN_GENERATED_KEYS)) {
+            statement.setString(1, book.getTitle());
+            statement.setBigDecimal(2, book.getPrice());
+            int affectedRows = statement.executeUpdate();
+            checkInsertedRowsAmount(affectedRows);
+
+            ResultSet generatedKeys = statement.getGeneratedKeys();
+            if(generatedKeys.next()) {
+                Long id = generatedKeys.getObject(1, Long.class);
+                book.setId(id);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't add new book: " + book, e);
+        }
+        return book;
+    }
+
+    @Override
+    public Optional<Book> findById(Long id) {
+        String query = "SELECT * FROM books WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(query)) {
+            statement.setLong(1, id);
+            ResultSet resultSet = statement.executeQuery();
+            if (resultSet.next()) {
+                Book createdBook = createBook(resultSet);
+                return Optional.of(createdBook);
+            }
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't find book by id. ID = " + id, e);
+        }
+        return Optional.empty();
+    }
+
+    @Override
+    public List<Book> findAll() {
+        String query = "SELECT * FROM books";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(query)) {
+            ResultSet resultSet = statement.executeQuery();
+            List<Book> books = new ArrayList<>();
+            while (resultSet.next()) {
+                books.add(createBook(resultSet));
+            }
+            return books;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't find all books.", e);
+        }
+    }
+
+    @Override
+    public Book update(Book book) {
+        String query = "UPDATE books SET title = ?, price = ? WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(query)) {
+            statement.setString(1, book.getTitle());
+            statement.setBigDecimal(2, book.getPrice());
+            statement.setLong(3, book.getId());
+            int affectedRows = statement.executeUpdate();
+            checkInsertedRowsAmount(affectedRows);
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't update the book: " + book, e);
+        }
+        return book;
+    }
+
+    @Override
+    public boolean deleteById(Long id) {
+        String query = "DELETE FROM books WHERE id = ?";
+        try (Connection connection = ConnectionUtil.getConnection();
+             PreparedStatement statement = connection.prepareStatement(query)) {
+            statement.setLong(1, id);
+            int affectedRows = statement.executeUpdate();
+            return affectedRows > 0;
+        } catch (SQLException e) {
+            throw new DataProcessingException("Can't delete book by id. ID = " + id, e);
+        }
+    }
+
+    private Book createBook(ResultSet resultSet) throws SQLException {
+        Book book = new Book();
+        book.setId(resultSet.getObject("id", Long.class));
+        book.setTitle(resultSet.getString("title"));
+        book.setPrice(resultSet.getBigDecimal("price"));
+        return book;
+    }
+
+    private void checkInsertedRowsAmount(int affectedRows) {
+        if (affectedRows < 1) {
+            throw new RuntimeException("Expected to insert at least 1 row, but inserted 0 rows.");
+        }
+    }
+}

src/main/java/mate/academy/exception/DataProcessingException.java

@@ -0,0 +1,7 @@
+package mate.academy.exception;
+
+public class DataProcessingException extends RuntimeException {
+    public DataProcessingException(String message, Throwable ex) {
+        super(message, ex);
+    }
+}

src/main/java/mate/academy/model/Book.java

@@ -0,0 +1,42 @@
+package mate.academy.model;
+
+import java.math.BigDecimal;
+
+public class Book {
+    private Long id;
+    private String title;
+    private BigDecimal price;
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public BigDecimal getPrice() {
+        return price;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public void setPrice(BigDecimal price) {
+        this.price = price;
+    }
+
+    @Override
+    public String toString() {
+        return "Book{" +
+                "id=" + id +
+                ", title='" + title + '\'' +
+                ", price=" + price +
+                '}';
+    }
+}

src/main/java/mate/academy/services/ConnectionUtil.java

@@ -0,0 +1,26 @@
+package mate.academy.services;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.Properties;
+
+public class ConnectionUtil {
+    private static final String DB_URL = "jdbc:mysql://localhost:3306/test";
+    private static final Properties DB_PROPERTIES;
+
+    static {
+        DB_PROPERTIES = new Properties();
+        DB_PROPERTIES.put("user", "root");
+        DB_PROPERTIES.put("password", "Root12345");
+        try {
+            Class.forName("com.mysql.cj.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException("Can't load JDBC driver", e);
+        }
+    }
+
+    public static Connection getConnection() throws SQLException {
+        return DriverManager.getConnection(DB_URL, DB_PROPERTIES);
+    }
+}

src/main/resources/init_db.sql

@@ -0,0 +1,6 @@
+CREATE TABLE books (
+`id` BIGINT NOT NULL AUTO_INCREMENT,
+`title` VARCHAR(255),
+`price` BIGINT,
+PRIMARY KEY (`id`)
+);